<ref name="Longino_1989">{{cite journal |first1=J. T. |last1=Longino |year=1989 |title=Geographic variation and community structure in an ant-plant mutualism: ''Azteca'' and ''Cecropia'' in Costa Rica |url= |journal=Biotropica |publisher= |volume=21 |issue= |pages=126–132 |doi= }}</ref>